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Investigators believe a Russian couple knocked their victims out with sedatives, then skinned them alive. Afterward, police say, they ate parts of their victims, froze the remains or packed them in jars filled with saline solution.

Otto Warmbier was arrested in January 2016 at the end of a brief tourist visit to North Korea. He had been medically evacuated and was being treated at the University of Cincinnati Medical Center when he died at age 22.